Where is the heater relay located in a 98 civic?

In a 1998 Honda Civic, the heater relay is typically located in the under-hood fuse/relay box, which is situated near the battery. To access it, you may need to remove the cover of the fuse box, and the heater relay will be marked on the diagram inside the cover. If you're having trouble finding it, consulting the vehicle's service manual can provide specific details.